Display screen or portion thereof with a graphical user interface



The sole FIGURE is a display screen or portion thereof with a graphicaluser interface showing the new design.

The outermost broken line illustrates the display screen or portionthereof. The remainder of the broken lines illustrate portions of thegraphical user interface. None of the broken lines form part of theclaimed design.

CLAIM The ornamental design for a display screen or portion thereof witha graphical user interface, as shown and described.